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All Journal JFA (Jurnal Fisika dan Aplikasinya) Journal of Natural Sciences and Mathematics Research Journal of Geoscience, Engineering, Environment, and Technology Magnetic: Research Journal of Physics and It’s Application Newton-Maxwell Journal of Physics APPA : Jurnal Pengabdian Kepada Masyarakat Physical Sciences, Life Science and Engineering
Achmad, Arifin
Department Of Physics, Universitas Jenderal Soedirman
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Social Sciences

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Review Perumusan Teori Kapasitas Panas Einstein-Debye Menggunakan Integral Lintasan Feynman Achmad, Arifin; Muflihatun; Fadli, Rizqi
Physical Sciences, Life Science and Engineering Vol. 2 No. 1 (2024): December
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/pslse.v2i1.321

Abstract

Teori Einstein-Debye memberikan deskripsi mekanika kuantum tentang kalor jenis zat padat, khususnya pada suhu rendah. Secara tradisional, teori ini telah dirumuskan menggunakan kuantisasi mode getaran dalam kisi kristal. Dalam artikel ini, kami menyajikan formulasi teori Einstein-Debye dengan menggunakan integral lintasan Feynman. Formulasi ini memberikan gambaran yang lebih mendalam tentang mekanika statistik kuantum getaran kisi, yang menawarkan kerangka kerja terpadu untuk memperoleh kalor jenis zat padat. Dengan menggunakan integral lintasan, kami mengeksplorasi kontribusi berbagai mode getaran dan pengaruhnya terhadap sifat termodinamika zat padat, yang memberikan perspektif baru tentang model Einstein dan Debye dalam satu teori yang koheren.
Quantum Square Wells with Capacitive Walls: A Toy Model for Quantum Capacitors Achmad, Arifin
Jurnal Fisika dan Aplikasinya Vol 21, No 2 (2025)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i2.22083

Abstract

This research aims to determine the energy quantization in a one-dimensional infinite square well modified by capacitive walls. The electric field inside the wall produces a linear potential. The solution to the Schrödinger equation is the Airy function for an infinite square well. Furthermore, the Wentzel–Kramers–Brillouin (WKB) approach is applied to finite wells, and the energy quantization for both cases based on this modified potential has been derived. In this paper, we also examine the quantum capacitance of the system, which is determined from the density of states and depends on dimensionality. The results obtained show that there is compatibility between the simple model that we work on and several systems, for example, graphene-base system.
Pembangkitan Massa Partikel Neutrino dengan Fermion Triplet Melalui Mekanisme Seesaw Tipe III Ety Kurniati; Kadek Ayu Cintya Adelia; Arifin Achmad; Luqman Hakim
Magnetic: Research Journal of Physics and It’s Application Vol. 5 No. 2 (2025): Magnetic: Research Journal of Physics and It’s Application
Publisher : Program Studi Fisika - Universitas San Pedro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59632/magnetic.v5i2.626

Abstract

Neutrino merupakan partikel yang sangat ringan, tidak memiliki muatan dan interaksi dengan materi lainnya sangat lemah. Massa partikel neutrino dalam pembahasan ini dibangkitkan dengan fermion triple melalui mekanisme seesaw III. Mekanisme Seesaw merupakan salah satu mekanisme untuk membangkitkan massa partikel neutrino yang tidak tercakup dalam Model Standar (MS) fisika partikel.  Hal ini berarti bahwa mekanisme seesaw merupakan alternatif dari MS. Kajian dalam artikel ini bersifat teoritis dan didukung oleh studi literatur. Massa partikel neutrino dapat terbentuk secara konsisten dengan menganalisis peran fermion triplet dalam Lagrangian menggunakan mekanisme Seesaw tipe III.  
Estimasi Koreksi Relativistik pada Efisiensi Mesin Carnot dalam Kerangka Non-Inersia Achmad, Arifin; Muflihatun; Pratiwi, Sulistiyani Hayu
Newton-Maxwell Journal of Physics Vol. 6 No. 2: Oktober 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/nmj.v6i2.41104

Abstract

This paper investigates relativistic corrections to the efficiency of Carnot engines in non-inertial frames, focusing on massive objects such as neutron stars and black holes.  The results of this study show that, in non-inertial frames, the local temperature and the efficiency of Carnot engines are influenced by rotation and linear acceleration. Using a relativistic approach, it is found that the efficiency correction depends on the acceleration and angular velocity parameters. Simulation results indicate that relativistic corrections become significant under extreme conditions, such as rapidly rotating neutron stars of about 10-4 to 10-3 or in strong gravitational fields around black holes of about O (1). This paper does not examine in detail the mass distribution, magnetic field effects on rotating neutron stars, or quantum effects on black holes. Instead, it focuses on estimating the Tolman temperature correction for non-inertial frames.
Seismicity analysis of the Southern Java region (2020-2024) based on the b-value and a-value using the maximum Likelihood method Apriyanti, Syafrida Dwi; Fatmasari, Nurvita; Wijayanto, Mirda Prisma; Achmad, Arifin; Muflihatun
Journal of Natural Sciences and Mathematics Research Vol. 11 No. 2 (2025): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jnsmr.v11i2.27765

Abstract

This study investigates the seismicity analysis of the Southern Java region using earthquake data obtained from BMKG Banjarnegara, comprising 1064 events recorded between 2020 and 2024. The study area spans coordinate 7.5°S-8.5°S and 108.31°E-109.50°E. The analysis was conducted using Microsoft Excel, ZMAP 7.0, and QGIS 3.28.2 to calculate the a-value and b-value, key parameters that describe the frequency and magnitude distribution of earthquakes. The magnitude of 2.6 was the most frequently observed, with 150 recorded events, while earthquakes occurring at a depth of 10 km were the most common, totaling 210 events. The high density of seismic occurrences reflects significant tectonic activity in the region. Using the maximum likelihood method, the b-value was determined to be approximately 1.09 ± 0.04, and the a-value was calculated at 5.754. The relatively low b-value suggests areas of elevated stress, implying potential for larger-magnitude earthquakes. Additionally, the spatial distribution of the a-value highlights regions of heightened seismic activity. These findings contribute to a deeper understanding of seismic behavior in Southern Java and offer valuable insights to support disaster risk reduction and earthquake mitigation efforts in the region.
Tsunami Evacuation Route Optimization Based on Megathrust Scenario Modeling in Pangandaran, West Java, Indonesia Wijayanto, Mirda Prisma; Achmad, Arifin; Muflihatun; Mahfud, Chiquita Laila; Apriyanti, Syafrida Dwi; Zakia, Zulfa Siti
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.23739

Abstract

The southern coastal area of West Java, particularly Pangandaran, faces a high risk of tsunami disasters triggered by megathrust earthquakes. However, current evacuation strategies in the region often lack integration between seismic hazard analysis, tsunami wave propagation modeling, and evacuation route optimization. To address this gap, this study aims to develop an integrated framework that combines seismicity assessment, tsunami simulation, and optimal evacuation planning for the Pangandaran coastal region. Seismic records from 2000 to 2024 indicate a total of 3090 earthquake events, predominantly offshore, with magnitudes ranging from low to moderate. The estimated b-value (1.19 ± 0.04) and a-value (8.057) reflect significant tectonic stress within the subduction zone between the Indo-Australian and Eurasian plates. Spatial analysis highlights offshore zones as areas of elevated seismic risk with the potential for large-magnitude events. Tsunami modeling was performed using the COMCOT model under a scenario of an 8.7 Mw megathrust earthquake. The simulation revealed maximum wave heights of up to 18.59 meters, reaching the coast within 40–45 minutes. Natural features such as coastal conservation zones were observed to reduce wave intensity, underscoring their role in hazard mitigation. Evacuation route modeling was carried out using Dijkstra’s algorithm, with two designated starting points located in the eastern and western sectors of Pangandaran Beach. The optimal routes identified to a designated Temporary Evacuation Site (TES) produced travel distances of 1.093 km and 0.533 km, requiring 26.23 and 12.79 minutes respectively, both within the available time window before tsunami impact. The findings offer actionable input for local disaster preparedness and evacuation planning. Furthermore, this study demonstrates the practical application of graph theory in disaster mitigation and provides a scalable framework for tsunami-prone regions worldwide.
Pembinaan Mahasiswa Fisika UNSOED dalam Mengikuti ONMIPA-PT pada materi Fisika Modern dan Mekanika Kuantum Achmad, Arifin; Wijayanto, Mirda Prisma; Muflihatun, Muflihatun; Fadli, Rizqi; Pratiwi, Sulistiyani Hayu
APPA : Jurnal Pengabdian Kepada Masyarakat Vol 3 No 4 (2025): APPA : Jurnal Pengabdian kepada Masyarakat (INPRESS)
Publisher : Shofanah Media Berkah

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Olimpiade Nasional Matematika dan Ilmu Pengetahuan Alam Perguruan Tinggi (ONMIPA-PT) merupakan ajang kompetisi nasional yang menuntut penguasaan konsep, analisis matematis, dan kemampuan pemecahan masalah tingkat lanjut. Bidang Fisika, khususnya materi Fisika Modern dan Mekanika Kuantum, sering menjadi tantangan bagi mahasiswa karena karakter konsep yang abstrak dan matematis. Kegiatan ini bertujuan untuk meningkatkan kesiapan dan kompetensi mahasiswa Fisika Universitas Jenderal Soedirman (UNSOED) dalam menghadapi ONMIPA-PT melalui program pembinaan terstruktur yang terdiri atas dua sesi pembelajaran, dilengkapi dengan pretest dan posttest serta evaluasi kepuasan peserta. Metode yang digunakan meliputi ceramah interaktif, diskusi konsep, latihan soal tipe ONMIPA-PT, dan pembahasan mendalam. Hasil kegiatan menunjukkan adanya peningkatan pada nilai posttest dibandingkan pretest. Dari hasil survei setelah kegiatan, disimpulkan bahwa mahasiswa merasakan manfaat terhadap kegiatan ini dan program ini direkomendasikan untuk dilaksanakan secara berkelanjutan.
Co-Authors Apriyanti, Syafrida Dwi Ety Kurniati Fadli, Rizqi Fatmasari, Nurvita Kadek Ayu Cintya Adelia Luqman Hakim Mahfud, Chiquita Laila Mirda Prisma Wijayanto Muflihatun Muflihatun, Muflihatun Pratiwi, Sulistiyani Hayu Zakia, Zulfa Siti